A delayed all-or-none hyperpolarisation induced by a single Ca action potential in hamster eggs

A delayed all-or-none hyperpolarisation induced by a single Ca action potential in hamster eggs

A transient change of membrane potential and resistance could be evoked after a long latency (ca. 9 s) by a single calcium action potential in some unfertilized hamster eggs. The estimated reversal potential for the delayed response was close to EK supporting the conclusion that K channels were open...

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Veröffentlicht in:Pflügers Archiv 1988-09, Vol.412 (4), p.451-453
Hauptverfasser: McNiven, A I, Yoshida, S, Georgiou, P, House, C R
Format: Artikel
Sprache:eng
Schlagworte:
Action Potentials
Animals
Calcium - pharmacology
Cricetinae
Female
In Vitro Techniques
Mesocricetus
Ovum - drug effects
Ovum - physiology
Potassium Channels - physiology
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container_title Pflügers Archiv
container_volume 412
creator McNiven, A I
Yoshida, S
Georgiou, P
House, C R
description A transient change of membrane potential and resistance could be evoked after a long latency (ca. 9 s) by a single calcium action potential in some unfertilized hamster eggs. The estimated reversal potential for the delayed response was close to EK supporting the conclusion that K channels were opened indirectly by the Ca2+ influx through voltage-gated channels. A second action potential elicited after the first did not induce a similar response. A number of treatments (insertion of a Ca2+ pipette, application of Na+-free solution, La3+ or high external pH) likely to raise [Ca2+]i also induced similar large changes of potential and resistance after which a single action potential failed to evoke a large delayed response. The evidence indicates that a small rise in [Ca2+]i activates a slow process leading to a further large increase in [Ca2+]i.
doi_str_mv 10.1007/BF01907568
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subjects Action Potentials
Animals
Calcium - pharmacology
Cricetinae
Female
In Vitro Techniques
Mesocricetus
Ovum - drug effects
Ovum - physiology
Potassium Channels - physiology
title A delayed all-or-none hyperpolarisation induced by a single Ca action potential in hamster eggs
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